The answer would be:
A. Mysterious self.
Here's is more about Johari's Window:
This is a model that helps understand how you communicate with others. It is divided into 4:
Open self - This refers to things about you that you and others know.
Hidden self - This refers to things about you that you already know but others do not.
Blind self - This refers to things about you that you do not know but others observed.
Unknown self - Things about you that you and others have yet to discover.
The answer is option B "horn." The land form horn was formed because when glaciers erode down to form a sharp peak which is called a horn. All of the other options are false because none of those land forms are formed because of the erosion of glaciers only horns are.
Hope this helps.
100 centimeters make up one meter